blob: ce06149088c5b5366cd4c87b67dfffdb793fc7a6 [file] [log] [blame]
Rafael J. Wysockif58b0822013-03-06 23:46:20 +01001/*
2 * ACPI support for Intel Lynxpoint LPSS.
3 *
4 * Copyright (C) 2013, Intel Corporation
5 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
6 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/acpi.h>
14#include <linux/clk.h>
15#include <linux/clkdev.h>
16#include <linux/clk-provider.h>
17#include <linux/err.h>
18#include <linux/io.h>
19#include <linux/platform_device.h>
20#include <linux/platform_data/clk-lpss.h>
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010021#include <linux/pm_runtime.h>
Heikki Krogerusc78b0832014-05-23 16:15:09 +030022#include <linux/delay.h>
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010023
24#include "internal.h"
25
26ACPI_MODULE_NAME("acpi_lpss");
27
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +020028#ifdef CONFIG_X86_INTEL_LPSS
29
30#define LPSS_ADDR(desc) ((unsigned long)&desc)
31
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010032#define LPSS_CLK_SIZE 0x04
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010033#define LPSS_LTR_SIZE 0x18
34
35/* Offsets relative to LPSS_PRIVATE_OFFSET */
Heikki Krogerused3a8722014-05-19 14:42:07 +030036#define LPSS_CLK_DIVIDER_DEF_MASK (BIT(1) | BIT(16))
Mika Westerberg765bdd42014-06-17 14:33:39 +030037#define LPSS_RESETS 0x04
38#define LPSS_RESETS_RESET_FUNC BIT(0)
39#define LPSS_RESETS_RESET_APB BIT(1)
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010040#define LPSS_GENERAL 0x08
41#define LPSS_GENERAL_LTR_MODE_SW BIT(2)
Heikki Krogerus088f1fd2013-10-09 09:49:20 +030042#define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010043#define LPSS_SW_LTR 0x10
44#define LPSS_AUTO_LTR 0x14
Rafael J. Wysocki1a8f8352014-02-11 00:35:53 +010045#define LPSS_LTR_SNOOP_REQ BIT(15)
46#define LPSS_LTR_SNOOP_MASK 0x0000FFFF
47#define LPSS_LTR_SNOOP_LAT_1US 0x800
48#define LPSS_LTR_SNOOP_LAT_32US 0xC00
49#define LPSS_LTR_SNOOP_LAT_SHIFT 5
50#define LPSS_LTR_SNOOP_LAT_CUTOFF 3000
51#define LPSS_LTR_MAX_VAL 0x3FF
Heikki Krogerus06d86412013-06-17 13:25:46 +030052#define LPSS_TX_INT 0x20
53#define LPSS_TX_INT_MASK BIT(1)
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010054
Heikki Krogerusc78b0832014-05-23 16:15:09 +030055#define LPSS_PRV_REG_COUNT 9
56
Mika Westerbergf6272172013-05-13 12:42:44 +000057struct lpss_shared_clock {
58 const char *name;
59 unsigned long rate;
60 struct clk *clk;
61};
62
Heikki Krogerus06d86412013-06-17 13:25:46 +030063struct lpss_private_data;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010064
65struct lpss_device_desc {
66 bool clk_required;
Rafael J. Wysockib59cc202013-05-08 11:55:49 +030067 const char *clkdev_name;
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +010068 bool ltr_required;
69 unsigned int prv_offset;
Mika Westerberg958c4eb2013-06-18 16:51:35 +030070 size_t prv_size_override;
Heikki Krogerused3a8722014-05-19 14:42:07 +030071 bool clk_divider;
Mika Westerbergf6272172013-05-13 12:42:44 +000072 bool clk_gate;
Heikki Krogerusc78b0832014-05-23 16:15:09 +030073 bool save_ctx;
Mika Westerbergf6272172013-05-13 12:42:44 +000074 struct lpss_shared_clock *shared_clock;
Heikki Krogerus06d86412013-06-17 13:25:46 +030075 void (*setup)(struct lpss_private_data *pdata);
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010076};
77
Rafael J. Wysockib59cc202013-05-08 11:55:49 +030078static struct lpss_device_desc lpss_dma_desc = {
79 .clk_required = true,
80 .clkdev_name = "hclk",
81};
82
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010083struct lpss_private_data {
84 void __iomem *mmio_base;
85 resource_size_t mmio_size;
86 struct clk *clk;
87 const struct lpss_device_desc *dev_desc;
Heikki Krogerusc78b0832014-05-23 16:15:09 +030088 u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
Rafael J. Wysockif58b0822013-03-06 23:46:20 +010089};
90
Heikki Krogerus06d86412013-06-17 13:25:46 +030091static void lpss_uart_setup(struct lpss_private_data *pdata)
92{
Heikki Krogerus088f1fd2013-10-09 09:49:20 +030093 unsigned int offset;
Heikki Krogerus06d86412013-06-17 13:25:46 +030094 u32 reg;
95
Heikki Krogerus088f1fd2013-10-09 09:49:20 +030096 offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
97 reg = readl(pdata->mmio_base + offset);
98 writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
99
100 offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
101 reg = readl(pdata->mmio_base + offset);
102 writel(reg | LPSS_GENERAL_UART_RTS_OVRD, pdata->mmio_base + offset);
Heikki Krogerus06d86412013-06-17 13:25:46 +0300103}
104
Mika Westerberg765bdd42014-06-17 14:33:39 +0300105static void lpss_i2c_setup(struct lpss_private_data *pdata)
106{
107 unsigned int offset;
108 u32 val;
109
110 offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
111 val = readl(pdata->mmio_base + offset);
112 val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
113 writel(val, pdata->mmio_base + offset);
114}
115
Jie Yang43218a12014-08-01 09:06:35 +0800116static struct lpss_device_desc wpt_dev_desc = {
117 .clk_required = true,
118 .prv_offset = 0x800,
119 .ltr_required = true,
120 .clk_divider = true,
121 .clk_gate = true,
122};
123
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100124static struct lpss_device_desc lpt_dev_desc = {
125 .clk_required = true,
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100126 .prv_offset = 0x800,
127 .ltr_required = true,
Heikki Krogerused3a8722014-05-19 14:42:07 +0300128 .clk_divider = true,
129 .clk_gate = true,
130};
131
132static struct lpss_device_desc lpt_i2c_dev_desc = {
133 .clk_required = true,
134 .prv_offset = 0x800,
135 .ltr_required = true,
Mika Westerbergf6272172013-05-13 12:42:44 +0000136 .clk_gate = true,
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100137};
138
Heikki Krogerus06d86412013-06-17 13:25:46 +0300139static struct lpss_device_desc lpt_uart_dev_desc = {
140 .clk_required = true,
141 .prv_offset = 0x800,
142 .ltr_required = true,
Heikki Krogerused3a8722014-05-19 14:42:07 +0300143 .clk_divider = true,
Heikki Krogerus06d86412013-06-17 13:25:46 +0300144 .clk_gate = true,
145 .setup = lpss_uart_setup,
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100146};
147
148static struct lpss_device_desc lpt_sdio_dev_desc = {
149 .prv_offset = 0x1000,
Mika Westerberg958c4eb2013-06-18 16:51:35 +0300150 .prv_size_override = 0x1018,
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100151 .ltr_required = true,
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100152};
153
Chew, Chiau Eee1c74812014-02-19 02:24:29 +0800154static struct lpss_shared_clock pwm_clock = {
155 .name = "pwm_clk",
156 .rate = 25000000,
157};
158
159static struct lpss_device_desc byt_pwm_dev_desc = {
160 .clk_required = true,
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300161 .save_ctx = true,
Chew, Chiau Eee1c74812014-02-19 02:24:29 +0800162 .shared_clock = &pwm_clock,
163};
164
Mika Westerbergf6272172013-05-13 12:42:44 +0000165static struct lpss_device_desc byt_uart_dev_desc = {
166 .clk_required = true,
167 .prv_offset = 0x800,
Heikki Krogerused3a8722014-05-19 14:42:07 +0300168 .clk_divider = true,
Mika Westerbergf6272172013-05-13 12:42:44 +0000169 .clk_gate = true,
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300170 .save_ctx = true,
Heikki Krogerus06d86412013-06-17 13:25:46 +0300171 .setup = lpss_uart_setup,
Mika Westerbergf6272172013-05-13 12:42:44 +0000172};
173
Mika Westerbergf6272172013-05-13 12:42:44 +0000174static struct lpss_device_desc byt_spi_dev_desc = {
175 .clk_required = true,
176 .prv_offset = 0x400,
Heikki Krogerused3a8722014-05-19 14:42:07 +0300177 .clk_divider = true,
Mika Westerbergf6272172013-05-13 12:42:44 +0000178 .clk_gate = true,
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300179 .save_ctx = true,
Mika Westerbergf6272172013-05-13 12:42:44 +0000180};
181
182static struct lpss_device_desc byt_sdio_dev_desc = {
183 .clk_required = true,
184};
185
186static struct lpss_shared_clock i2c_clock = {
187 .name = "i2c_clk",
188 .rate = 100000000,
189};
190
191static struct lpss_device_desc byt_i2c_dev_desc = {
192 .clk_required = true,
193 .prv_offset = 0x800,
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300194 .save_ctx = true,
Mika Westerbergf6272172013-05-13 12:42:44 +0000195 .shared_clock = &i2c_clock,
Mika Westerberg765bdd42014-06-17 14:33:39 +0300196 .setup = lpss_i2c_setup,
Mika Westerbergf6272172013-05-13 12:42:44 +0000197};
198
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +0200199#else
200
201#define LPSS_ADDR(desc) (0UL)
202
203#endif /* CONFIG_X86_INTEL_LPSS */
204
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100205static const struct acpi_device_id acpi_lpss_device_ids[] = {
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300206 /* Generic LPSS devices */
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +0200207 { "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300208
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100209 /* Lynxpoint LPSS devices */
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +0200210 { "INT33C0", LPSS_ADDR(lpt_dev_desc) },
211 { "INT33C1", LPSS_ADDR(lpt_dev_desc) },
212 { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
213 { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
214 { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
215 { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
216 { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100217 { "INT33C7", },
218
Mika Westerbergf6272172013-05-13 12:42:44 +0000219 /* BayTrail LPSS devices */
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +0200220 { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
221 { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
222 { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
223 { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
224 { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
Mika Westerbergf6272172013-05-13 12:42:44 +0000225 { "INT33B2", },
Jin Yao20482d32014-05-15 18:28:46 +0300226 { "INT33FC", },
Mika Westerbergf6272172013-05-13 12:42:44 +0000227
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +0200228 { "INT3430", LPSS_ADDR(lpt_dev_desc) },
229 { "INT3431", LPSS_ADDR(lpt_dev_desc) },
230 { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
231 { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
232 { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
233 { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
234 { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
Mika Westerberga4d97532013-11-12 11:48:19 +0200235 { "INT3437", },
236
Jie Yang43218a12014-08-01 09:06:35 +0800237 { "INT3438", LPSS_ADDR(wpt_dev_desc) },
238
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100239 { }
240};
241
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +0200242#ifdef CONFIG_X86_INTEL_LPSS
243
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100244static int is_memory(struct acpi_resource *res, void *not_used)
245{
246 struct resource r;
247 return !acpi_dev_resource_memory(res, &r);
248}
249
250/* LPSS main clock device. */
251static struct platform_device *lpss_clk_dev;
252
253static inline void lpt_register_clock_device(void)
254{
255 lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
256}
257
258static int register_device_clock(struct acpi_device *adev,
259 struct lpss_private_data *pdata)
260{
261 const struct lpss_device_desc *dev_desc = pdata->dev_desc;
Mika Westerbergf6272172013-05-13 12:42:44 +0000262 struct lpss_shared_clock *shared_clock = dev_desc->shared_clock;
Heikki Krogerused3a8722014-05-19 14:42:07 +0300263 const char *devname = dev_name(&adev->dev);
Mika Westerbergf6272172013-05-13 12:42:44 +0000264 struct clk *clk = ERR_PTR(-ENODEV);
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300265 struct lpss_clk_data *clk_data;
Heikki Krogerused3a8722014-05-19 14:42:07 +0300266 const char *parent, *clk_name;
267 void __iomem *prv_base;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100268
269 if (!lpss_clk_dev)
270 lpt_register_clock_device();
271
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300272 clk_data = platform_get_drvdata(lpss_clk_dev);
273 if (!clk_data)
274 return -ENODEV;
275
276 if (dev_desc->clkdev_name) {
277 clk_register_clkdev(clk_data->clk, dev_desc->clkdev_name,
Heikki Krogerused3a8722014-05-19 14:42:07 +0300278 devname);
Rafael J. Wysockib59cc202013-05-08 11:55:49 +0300279 return 0;
280 }
281
282 if (!pdata->mmio_base
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100283 || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100284 return -ENODATA;
285
Mika Westerbergf6272172013-05-13 12:42:44 +0000286 parent = clk_data->name;
Heikki Krogerused3a8722014-05-19 14:42:07 +0300287 prv_base = pdata->mmio_base + dev_desc->prv_offset;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100288
Mika Westerbergf6272172013-05-13 12:42:44 +0000289 if (shared_clock) {
290 clk = shared_clock->clk;
291 if (!clk) {
292 clk = clk_register_fixed_rate(NULL, shared_clock->name,
293 "lpss_clk", 0,
294 shared_clock->rate);
295 shared_clock->clk = clk;
296 }
297 parent = shared_clock->name;
298 }
299
300 if (dev_desc->clk_gate) {
Heikki Krogerused3a8722014-05-19 14:42:07 +0300301 clk = clk_register_gate(NULL, devname, parent, 0,
302 prv_base, 0, 0, NULL);
303 parent = devname;
304 }
305
306 if (dev_desc->clk_divider) {
307 /* Prevent division by zero */
308 if (!readl(prv_base))
309 writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
310
311 clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
312 if (!clk_name)
313 return -ENOMEM;
314 clk = clk_register_fractional_divider(NULL, clk_name, parent,
315 0, prv_base,
316 1, 15, 16, 15, 0, NULL);
317 parent = clk_name;
318
319 clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
320 if (!clk_name) {
321 kfree(parent);
322 return -ENOMEM;
323 }
324 clk = clk_register_gate(NULL, clk_name, parent,
325 CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
326 prv_base, 31, 0, NULL);
327 kfree(parent);
328 kfree(clk_name);
Mika Westerbergf6272172013-05-13 12:42:44 +0000329 }
330
331 if (IS_ERR(clk))
332 return PTR_ERR(clk);
333
Heikki Krogerused3a8722014-05-19 14:42:07 +0300334 pdata->clk = clk;
335 clk_register_clkdev(clk, NULL, devname);
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100336 return 0;
337}
338
339static int acpi_lpss_create_device(struct acpi_device *adev,
340 const struct acpi_device_id *id)
341{
342 struct lpss_device_desc *dev_desc;
343 struct lpss_private_data *pdata;
344 struct resource_list_entry *rentry;
345 struct list_head resource_list;
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200346 struct platform_device *pdev;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100347 int ret;
348
349 dev_desc = (struct lpss_device_desc *)id->driver_data;
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200350 if (!dev_desc) {
351 pdev = acpi_create_platform_device(adev);
352 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
353 }
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100354 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
355 if (!pdata)
356 return -ENOMEM;
357
358 INIT_LIST_HEAD(&resource_list);
359 ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
360 if (ret < 0)
361 goto err_out;
362
363 list_for_each_entry(rentry, &resource_list, node)
364 if (resource_type(&rentry->res) == IORESOURCE_MEM) {
Mika Westerberg958c4eb2013-06-18 16:51:35 +0300365 if (dev_desc->prv_size_override)
366 pdata->mmio_size = dev_desc->prv_size_override;
367 else
368 pdata->mmio_size = resource_size(&rentry->res);
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100369 pdata->mmio_base = ioremap(rentry->res.start,
370 pdata->mmio_size);
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100371 break;
372 }
373
374 acpi_dev_free_resource_list(&resource_list);
375
Mika Westerbergaf65cfe2013-09-02 13:30:25 +0300376 pdata->dev_desc = dev_desc;
377
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100378 if (dev_desc->clk_required) {
379 ret = register_device_clock(adev, pdata);
380 if (ret) {
Rafael J. Wysockib9e95fc2013-06-19 00:45:34 +0200381 /* Skip the device, but continue the namespace scan. */
382 ret = 0;
383 goto err_out;
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100384 }
385 }
386
Rafael J. Wysockib9e95fc2013-06-19 00:45:34 +0200387 /*
388 * This works around a known issue in ACPI tables where LPSS devices
389 * have _PS0 and _PS3 without _PSC (and no power resources), so
390 * acpi_bus_init_power() will assume that the BIOS has put them into D0.
391 */
392 ret = acpi_device_fix_up_power(adev);
393 if (ret) {
394 /* Skip the device, but continue the namespace scan. */
395 ret = 0;
396 goto err_out;
397 }
398
Heikki Krogerus06d86412013-06-17 13:25:46 +0300399 if (dev_desc->setup)
400 dev_desc->setup(pdata);
401
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100402 adev->driver_data = pdata;
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200403 pdev = acpi_create_platform_device(adev);
404 if (!IS_ERR_OR_NULL(pdev)) {
405 device_enable_async_suspend(&pdev->dev);
406 return 1;
407 }
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100408
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200409 ret = PTR_ERR(pdev);
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100410 adev->driver_data = NULL;
411
412 err_out:
413 kfree(pdata);
414 return ret;
415}
416
Rafael J. Wysocki1a8f8352014-02-11 00:35:53 +0100417static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
418{
419 return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
420}
421
422static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
423 unsigned int reg)
424{
425 writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
426}
427
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100428static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
429{
430 struct acpi_device *adev;
431 struct lpss_private_data *pdata;
432 unsigned long flags;
433 int ret;
434
435 ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
436 if (WARN_ON(ret))
437 return ret;
438
439 spin_lock_irqsave(&dev->power.lock, flags);
440 if (pm_runtime_suspended(dev)) {
441 ret = -EAGAIN;
442 goto out;
443 }
444 pdata = acpi_driver_data(adev);
445 if (WARN_ON(!pdata || !pdata->mmio_base)) {
446 ret = -ENODEV;
447 goto out;
448 }
Rafael J. Wysocki1a8f8352014-02-11 00:35:53 +0100449 *val = __lpss_reg_read(pdata, reg);
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100450
451 out:
452 spin_unlock_irqrestore(&dev->power.lock, flags);
453 return ret;
454}
455
456static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
457 char *buf)
458{
459 u32 ltr_value = 0;
460 unsigned int reg;
461 int ret;
462
463 reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
464 ret = lpss_reg_read(dev, reg, &ltr_value);
465 if (ret)
466 return ret;
467
468 return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
469}
470
471static ssize_t lpss_ltr_mode_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
474 u32 ltr_mode = 0;
475 char *outstr;
476 int ret;
477
478 ret = lpss_reg_read(dev, LPSS_GENERAL, &ltr_mode);
479 if (ret)
480 return ret;
481
482 outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
483 return sprintf(buf, "%s\n", outstr);
484}
485
486static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
487static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
488static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
489
490static struct attribute *lpss_attrs[] = {
491 &dev_attr_auto_ltr.attr,
492 &dev_attr_sw_ltr.attr,
493 &dev_attr_ltr_mode.attr,
494 NULL,
495};
496
497static struct attribute_group lpss_attr_group = {
498 .attrs = lpss_attrs,
499 .name = "lpss_ltr",
500};
501
Rafael J. Wysocki1a8f8352014-02-11 00:35:53 +0100502static void acpi_lpss_set_ltr(struct device *dev, s32 val)
503{
504 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
505 u32 ltr_mode, ltr_val;
506
507 ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
508 if (val < 0) {
509 if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
510 ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
511 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
512 }
513 return;
514 }
515 ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
516 if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
517 ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
518 val = LPSS_LTR_MAX_VAL;
519 } else if (val > LPSS_LTR_MAX_VAL) {
520 ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
521 val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
522 } else {
523 ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
524 }
525 ltr_val |= val;
526 __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
527 if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
528 ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
529 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
530 }
531}
532
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300533#ifdef CONFIG_PM
534/**
535 * acpi_lpss_save_ctx() - Save the private registers of LPSS device
536 * @dev: LPSS device
537 *
538 * Most LPSS devices have private registers which may loose their context when
539 * the device is powered down. acpi_lpss_save_ctx() saves those registers into
540 * prv_reg_ctx array.
541 */
542static void acpi_lpss_save_ctx(struct device *dev)
543{
544 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
545 unsigned int i;
546
547 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
548 unsigned long offset = i * sizeof(u32);
549
550 pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
551 dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
552 pdata->prv_reg_ctx[i], offset);
553 }
554}
555
556/**
557 * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
558 * @dev: LPSS device
559 *
560 * Restores the registers that were previously stored with acpi_lpss_save_ctx().
561 */
562static void acpi_lpss_restore_ctx(struct device *dev)
563{
564 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
565 unsigned int i;
566
567 /*
568 * The following delay is needed or the subsequent write operations may
569 * fail. The LPSS devices are actually PCI devices and the PCI spec
570 * expects 10ms delay before the device can be accessed after D3 to D0
571 * transition.
572 */
573 msleep(10);
574
575 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
576 unsigned long offset = i * sizeof(u32);
577
578 __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
579 dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
580 pdata->prv_reg_ctx[i], offset);
581 }
582}
583
584#ifdef CONFIG_PM_SLEEP
585static int acpi_lpss_suspend_late(struct device *dev)
586{
587 int ret = pm_generic_suspend_late(dev);
588
589 if (ret)
590 return ret;
591
592 acpi_lpss_save_ctx(dev);
593 return acpi_dev_suspend_late(dev);
594}
595
596static int acpi_lpss_restore_early(struct device *dev)
597{
598 int ret = acpi_dev_resume_early(dev);
599
600 if (ret)
601 return ret;
602
603 acpi_lpss_restore_ctx(dev);
604 return pm_generic_resume_early(dev);
605}
606#endif /* CONFIG_PM_SLEEP */
607
608#ifdef CONFIG_PM_RUNTIME
609static int acpi_lpss_runtime_suspend(struct device *dev)
610{
611 int ret = pm_generic_runtime_suspend(dev);
612
613 if (ret)
614 return ret;
615
616 acpi_lpss_save_ctx(dev);
617 return acpi_dev_runtime_suspend(dev);
618}
619
620static int acpi_lpss_runtime_resume(struct device *dev)
621{
622 int ret = acpi_dev_runtime_resume(dev);
623
624 if (ret)
625 return ret;
626
627 acpi_lpss_restore_ctx(dev);
628 return pm_generic_runtime_resume(dev);
629}
630#endif /* CONFIG_PM_RUNTIME */
631#endif /* CONFIG_PM */
632
633static struct dev_pm_domain acpi_lpss_pm_domain = {
634 .ops = {
635#ifdef CONFIG_PM_SLEEP
636 .suspend_late = acpi_lpss_suspend_late,
637 .restore_early = acpi_lpss_restore_early,
638 .prepare = acpi_subsys_prepare,
639 .complete = acpi_subsys_complete,
640 .suspend = acpi_subsys_suspend,
641 .resume_early = acpi_subsys_resume_early,
642 .freeze = acpi_subsys_freeze,
643 .poweroff = acpi_subsys_suspend,
644 .poweroff_late = acpi_subsys_suspend_late,
645#endif
646#ifdef CONFIG_PM_RUNTIME
647 .runtime_suspend = acpi_lpss_runtime_suspend,
648 .runtime_resume = acpi_lpss_runtime_resume,
649#endif
650 },
651};
652
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100653static int acpi_lpss_platform_notify(struct notifier_block *nb,
654 unsigned long action, void *data)
655{
656 struct platform_device *pdev = to_platform_device(data);
657 struct lpss_private_data *pdata;
658 struct acpi_device *adev;
659 const struct acpi_device_id *id;
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100660
661 id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
662 if (!id || !id->driver_data)
663 return 0;
664
665 if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
666 return 0;
667
668 pdata = acpi_driver_data(adev);
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300669 if (!pdata || !pdata->mmio_base)
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100670 return 0;
671
672 if (pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
673 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
674 return 0;
675 }
676
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300677 switch (action) {
678 case BUS_NOTIFY_BOUND_DRIVER:
679 if (pdata->dev_desc->save_ctx)
680 pdev->dev.pm_domain = &acpi_lpss_pm_domain;
681 break;
682 case BUS_NOTIFY_UNBOUND_DRIVER:
683 if (pdata->dev_desc->save_ctx)
684 pdev->dev.pm_domain = NULL;
685 break;
686 case BUS_NOTIFY_ADD_DEVICE:
687 if (pdata->dev_desc->ltr_required)
688 return sysfs_create_group(&pdev->dev.kobj,
689 &lpss_attr_group);
690 case BUS_NOTIFY_DEL_DEVICE:
691 if (pdata->dev_desc->ltr_required)
692 sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
693 default:
694 break;
695 }
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100696
Heikki Krogerusc78b0832014-05-23 16:15:09 +0300697 return 0;
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100698}
699
700static struct notifier_block acpi_lpss_nb = {
701 .notifier_call = acpi_lpss_platform_notify,
702};
703
Rafael J. Wysocki1a8f8352014-02-11 00:35:53 +0100704static void acpi_lpss_bind(struct device *dev)
705{
706 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
707
708 if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required)
709 return;
710
711 if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
712 dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
713 else
714 dev_err(dev, "MMIO size insufficient to access LTR\n");
715}
716
717static void acpi_lpss_unbind(struct device *dev)
718{
719 dev->power.set_latency_tolerance = NULL;
720}
721
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100722static struct acpi_scan_handler lpss_handler = {
723 .ids = acpi_lpss_device_ids,
724 .attach = acpi_lpss_create_device,
Rafael J. Wysocki1a8f8352014-02-11 00:35:53 +0100725 .bind = acpi_lpss_bind,
726 .unbind = acpi_lpss_unbind,
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100727};
728
729void __init acpi_lpss_init(void)
730{
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100731 if (!lpt_clk_init()) {
732 bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100733 acpi_scan_add_handler(&lpss_handler);
Rafael J. Wysocki2e0f8822013-03-06 23:46:28 +0100734 }
Rafael J. Wysockif58b0822013-03-06 23:46:20 +0100735}
Rafael J. Wysockid6ddaaa2014-05-30 14:34:05 +0200736
737#else
738
739static struct acpi_scan_handler lpss_handler = {
740 .ids = acpi_lpss_device_ids,
741};
742
743void __init acpi_lpss_init(void)
744{
745 acpi_scan_add_handler(&lpss_handler);
746}
747
748#endif /* CONFIG_X86_INTEL_LPSS */